Has anyone experienced this? Whenever I hit a bump it feels like something is moving around in the seat back. There is no rattle or audible noise. I can't seem to replicate it when the vehicle is not in motion. Any thoughts?

I had the same problem with my driver's seat back. Went to the dealer 3 times and got the same response..."Could not replicate". So I took the seat back cover off to see the lumbar support. There is a white plastic part that is pushed up into the foam cushioning of the seat back. I put about 2 inches of batting in between the plastic part and the foam cushioning then put the back cover on and no more feeling of something moving in the seat back when I went over a bump or made a quick turn. I just noticed a TSB for the lower portion of the seats that need new isolator bushings on models built before Nov 24. My lower seat cushions make a loud clunking noise and shift back and forth when making quick turns or go over anything rough. Anyway hope this helps since most dealers give you the could not replicate response without even test driving it.

So I took the seat back cover off to see the lumbar support. There is a white plastic part that is pushed up into the foam cushioning of the seat back. I put about 2 inches of batting in between the plastic part and the foam cushioning

I have a squeak that recently started (2500 miles/3.5 mos old), in what sounds like the mid-to-upper portion of the drivers seatback.
Thanks for the idea, I'll be giving that a go to see it if resolves my issue.

I have a squeak that recently started (2500 miles/3.5 mos old), in what sounds like the mid-to-upper portion of the drivers seatback.
Thanks for the idea, I'll be giving that a go to see it if resolves my issue.

I have a squeak that recently started (2500 miles/3.5 mos old), in what sounds like the mid-to-upper portion of the drivers seatback.
Thanks for the idea, I'll be giving that a go to see it if resolves my issue.